Presser bar



Patented Jan. 15, 1929.,

UNITED STATES CHARLES H. GREENWOOD, 0F CANTON, OHIb.

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Application filed December 2, 1924. Serial No. 753,443.

The invention relates to improvements in presser bars for sewing machines and the objects of the invention are to provide a presser bar of simple and durable construction which is efficient in use and easily operated and which is provided with a novel construction of clamp for holding the presser foot or attachments and which is equally adapted to hold the especially constructed presser foot and attachment illustrated herein or a standard form of presser foot or attachment at present upon the market. p

The above and other objects may be at tained by constructing the presserbar in the manner illustrated in the accompanying drawing, in which- Figure 1 is an elevation of a portion of a sewing machine head partly in section, showing the improved presser bar mounted there- Fig. 2, a detail elevation of the improved presser bar;

Fig. 3, a cross section throughthe clamp portion of the presser bar taken on the line 3 3, Fig. 2, showing the presser toot clamped therein;

Fig. 4, a similar view showmg the presser foot removed;

Fig. 5, a section on the line 55, Fig. 3;

Fig. 6, a detached perspectlve view of the various portions of the clamp; Q

Fig. 7 a fragmentary perspectlve view of the upper portion of the presser foot or attachment; and

Fig. 8, a side elevation of the same.

Similar numerals refer to similar parts throughout the drawing.

A portion of the head of a sewing machine is illustrated at 1, and provided with a bore 2 to receive the presser bar indicated general- 1v at 3. The intermediate portion of this bore is round and is restricted at the upper end as at 4., forming a shoulder 5 for the coil spring 6, which is interposed between said shoulder and the shoulder 7 upon the presser bar formed between the large round portion 8 and the smaller upper round portion 9 thereof.

The lower portion of the presser bar 1s square in cross section, as indicated at 10 and the lower portion of the bore 2 is squared to receive the same. A cam lever 12 is pivoted as at 13 to the head 1, within a slot 14 and extends into a notch 15 in thepresser bar.

Thus by raising the cam lever 12, it will be seen that the presser bar is raised, against the action of the spring 6 and held in the raised position. 6 a

The lower end of the resser bar is provided with the reduced sliank 16 flush with the rear side of the presser bar only, as shown at 1T. A shoulder 18 isthus formed at the upper end of the shank, around three sides thereof, this shoulderbeing preferably incprigd upon the front face of the bar, as shown a" i An angular clamping member 20 is connected to the shank 16 of the presser bar by the screw 21, said screw being provided with the shoulder 22 to space thefront web 23 of i the angle from the front face of the shank, a head 24 being provided upon the shouldered end of the screw to prevent removal of the angular clamping member.

A nut 25 is provided upon the opposite threaded end of thescrew for drawing the angular clamping member toward the shank,

and prevented from removal by the head 26 uponthis end of the screw.

Therweb 27 of the angular clamping memher is located in sliding contact with the adacent side face of the shank 16 and the upper edges of the webs of the clamping member are shaped to fit the shoulders'18 and 19 of the presser bar.

With this construction, it will be obvious that there can be no turning movement of the clamp upon the screw and thus the vibration of the machine will not cause the clamp to loosen during operation.

The presser foot or attachment is provided with a shank 28 adapted to enter the opening between the front face of the shank 16 on the prcsser bar and the web 23 of the clamping member and provided with a transverse notch which may be downwardly inclined as shown at 29 arranged to engage the shouldered portion of the clamping screw, the upper end of this presser foot or attachment shank being inclined, as shown at 30, to conform with the 100 shoulder 19 upon the presser bar.

An angular flange 31 is preferably provided upon the presser foot or attachment to engage the adjacent side face of the presser bar shank 16. In attaching the presser foot 5 clamping member, the angular slot 29 engag- 110 ing the shouldered portion of the clamping screw and the angular upper edge 30 engaging the angular shoulder 19 of the presser bar, the flange 31 upon the presser foot or attachment engaging the adjacent side face of the shank 16 and acting as a stop to properly position the presser foot or attachment. By tightening the nut 25, the attachment is thus clamped tightly in place.

The thumb of the operator will naturally engage the web 31, upon the attachment, when the nut 25 is turned, thus insuring that the attachment t'orced into position in the clamp and held in this position as the clamping screw is tightened.

The reason tor the inclined slot 29 and the inclined coacting edges 30 and 19 is obvious; in the event the nut 25 is not fully tightened, it will be seen that with the downward movement of the presser bar, the foot or attachment will be forced into position. by means of this inclinded slot, and will be held upon the clamping screw, preventing accidental displacement of the same when in operation.

It will be seen that the clamp upon the presser bar provides means for quickly and easily inserting the presser foot or attachment, as the reduced shank at the lower end of the bar, together with the angular clamping member, forms a pocket closed on both sides and the top, to quickly guide the attachment into place, and the clamping screw, by engagement with the notch in the attachment, positions the attachment at. the proper height holding the upper end of the attachnieiit against. the shoulder on the bar, thus preventing the attachment from tilting out of a vertical position.

The usual form of presser foot or attachment such as is in general use, is provided with a vertical notch in its upper end and it will be seen that this form of attachment may be inserted from the lower end of the present clamp, the notch engaging the clamping screw and by tightening the nut 25, the attachment may be properly secured upon the presser bar.

I claim 1. A presser bar having a shouldered clan'iping screw through its lower end por tion, an angular clamping member upon said screw having a web slidably engaging one side only of the bar, a nut upon the clamping screw for drawing the clamping member toward the bar and an attachment having a shank with a transverse notch i'or engagement with the clamping screw.

2. A presser bar having a reduced shank at its lower end, a clamping screw through the shank, an angular clamping member upon said screw having a web slidably engaging one side only of the bar, a nut upon the screw for drawing the clan'iping member toward the bar and an attacl'nnent having a shank with a transverse notch for engagement with the clamping screw.

3. A presser bar having a reduced shank at its lower end, a shouldered clamping screw through the shank, an angular clamping member upon said screw having a web slidably engaging one side only of the bar, a nut upon the screw for drawing the clamp ing member toward the bar and an attachment having a shank with a tian verse notch for engagement with the clamping screw.

i. A presser bar having a shouldered clamping screw through its lower end por tion, an angular clamping member carried by said screw having a web slidably engaging one side of the bar, nut upon the clamping screw for d'awing the clamping member toward the bar, and an attachment having an angular shank provided with a notch for engagement with the clamping screw.

5. A presser bar having a shouldered clamping screw through its lower end portion. an angular clamping member carried by said screw having a web slidably engaging one side of the bar, a nut upon the clamp ing screw for drawing the clamping mam-- ber toward the bar, and an attachment having an angular shank provided with an inclined notch for engagement with the chimping screw.

6. A presser bar having a reduced shank at its lower end, a clamping screw through the shank, an angular clamping member upon said screw having a web slidably" engaging one side of the bar, a nut upon the screw for drawing the clamping member toward the bar, and an attachment having an angular shank provided with a notch for engagement. with the clamping screw.

In testimony that I claim the above, I have hereunto subscribed my name.

CHARLES H. GREENWOOD. 

